D3转换循环抛出Uncaught TypeError:t.call不是函数

Question

这是D3的新手,也是JS的新手.我试图在点击上创建一个圆圈,一旦创建该圆圈需要反复脉动.现在,它正在被正确创建并且它会进行一次转换,但之后由于错误而死亡.这是我的代码:

var shapesAtt = shapes
    // omitted: assigning fill, position, etc; working as intended
    .on("click", circleMouseClick);

function circleMouseClick(d, i)
{
    createPulse(this);
}

function createPulse(focusElement)
{
    // takes in "focal circle" element
    // some things here are hard coded for ease of reading 
    // (i.e. these variables aren't all useless)

    var focus = d3.select(focusElement);
    var origR = focus.attr("r");
    var origX = focus.attr("cx");
    var origY = focus.attr("cy");
    var origFill = focus.style("fill");

    var strokeColor = "black";

    var newG = svgContainer.append("g");
    var pulser = newG.append("circle").attr("id", "pulser")
        .style("fill", "none").style("stroke", strokeColor)
        .attr("cx", 150).attr("cy", 150)
        .attr("r", origR)
        .transition()
            .duration(2000)
            .each(pulsate);
}

function pulsate()
{
    var pulser = d3.select(this);
    pulser = pulser
        .transition().duration(2000)
            .attr("r", 25)
            .attr("stroke-width", 50)
        .transition().duration(2000)
            .attr("r", 90)
            .attr("stroke-width", 10)
        .each("end", pulsate);
}

我在Chrome中运行时收到的错误是:

Uncaught TypeError: t.call is not a function     d3.v4.min.js:4

我觉得它的问题部分是:

function pulsate()
{
    // ...   
    .each("end", pulsate);
}

Answer 1

这是因为您使用的是d3 version4.v4 API发生了重大变化,因此:

而不是使用

// ...   
.each("end", pulsate);//in d3 version 3

做

// ...   
.on("end", pulsate);//in d3 version 4

参考:https://github.com/d3/d3-transition#transition_on